A look inside the daily routine of billionaire investor Mark Cuban, who starts working the minute he wakes up and falls asleep to 'Law & Order'

Cuban hits the ground running every morning. "Business is my morning meditation," he told Entrepreneur in 2014. "Business is what I like. I get up and I work immediately. I love doing this."

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Back in 2014, Cuban said he'd specifically check Cyber Dust — his messaging app — upon waking up. Afterwards, he said he would go through his emails and "read, update and deal with whatever issues I have to address. First thing's first and the first thing for me is always work," he told Entrepreneur.

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Cuban told Thrive Global founder Arianna Huffington that he continues to check his email throughout the day. "If I'm laying in bed watching a game, if it's halftime of a Mav's game, that's when I'll do my emails," he said. "It allows me to disconnect from whatever other things that have my attention, and it actually works out really well."

When it comes to breakfast, he told D Magazine that his preferred meal is a cup of coffee with two high-protein, low-carb cookies from Alyssa's Bakery, a company he invests in. In 2014, Cuban said that he practically lived off "those cookies."

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In a "Shark Tank" blog entry, Cuban revealed that he would read for over three hours a day — a habit which annoyed his wife, Tiffany. "It gives me a level of comfort and confidence in my businesses," he wrote.

But he tends to avoid one other common part of the work day. "Meetings are a waste of time unless you are closing a deal," he told Inc. "There are so many ways to communicate in real time or asynchronously that any meeting you actually sit for should have a duration and set outcome before you agree to go."

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And when it comes to resting during the day, Cuban said he tries to listen to his body. "If I'm dragging, then I'll take a nap," he told Business Insider. "Look, I get to define my own schedule. Other than having to travel sometimes, I'm usually working on my own schedule. If I'm tired, I'll sleep."

Because he "put business first" before he started a family, Cuban said he's now able to "put family first." "So now I schedule around my kids as much as possible," he told the blog Life of Dad. "I can’t make all their games, but I make most."

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Part of that quality time involves ensuring his three kids aren't overdoing it when it comes to technology. He told Huffington that he monitors their screen time, and even installed "Cisco routers with management software" to ensure they're not subverting the rules.

Exercise is also a central part of Cuban's routine. He told The Dallas Morning News that he sticks to an hour of cardio six days a week.

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Business Insider previously reported his go-to workouts include "elliptical and stair gauntlet machines, playing basketball, and taking kickboxing and Latin fusion aerobic classes at Lifetime Fitness." According to D Magazine, one of his favorite workout songs is "Bangarang."

It's unclear whether or not Cuban has a usual dinner routine, but he did tell Men's Journal he'd go to McDonald's, buy two salads, put them in the same big bowl and sprinkle in "corn, cottage cheese, relish, and for croutons, some crunchy cereal." "My big ol' salad, a comfy couch, the game on TV — to me, that is the ultimate meal," he said.

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He told Huffington that he turns off his phone before bed, and often watches episodes of "Law & Order" to wind down. He uses headphones to avoid waking up Tiffany, and sets his TV to switch off automatically. "Maybe it's a bad habit," he said. "I think it's an old habit that I just haven't gotten rid of."

Most nights, Cuban tends to catch six to seven hours of shut-eye.

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But, Cuban told Entrepreneur in 2014 that he'll occasionally even wake up and start working in the middle of the night. "If something's on my mind, I'll get up several times at night and start hitting some Cyber Dust. I'll work."

For Cuban, it all comes down to working hard. "I tell people all the time, the one thing in life you can control is your effort," he told The National Review's Jamie Weinstein.

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